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		<title>栅格系统</title>
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			.a{
				height: 50px;
				border:1px solid #ccc;
				background: #eee;
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		<!--<div class="container">
			<div class="row">
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
				<div class="col-md-1 a">1</div>
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				<div class="col-md-9 a">9</div>
				<div class="col-md-3 a">3</div>
			</div>
			<div class="row">
				<div class="col-md-6 a">6</div>
				<div class="col-md-6 a">6</div>
			</div>
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		<!--<div class="container">
			<div class="row">
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
				<div class="col-lg-3 col-md-4 col-sm-6 a">a</div>
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				<div class="col-md-8 a">8</div>
				<div class="col-md-3 col-md-offset-1 a">3</div>
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			<div class="row" >
				<div class="col-md-9 a" style="padding: 0;">
					<div class="col-md-3 a">3</div>
					<div class="col-md-3 a">3</div>
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                                                                                                                                                                                                                                                                                                                                     lass="col-md-3 a">3</div>
					<div class="col-md-3 a">3</div>
				</div>
				<div class="col-md-3 a">3</div>
			</div>
			<div class="row">
				<div class="col-md-9 col-md-push-3 a">9</div>
				<div class="col-md-3 col-md-pull-9 a">3</div>
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